DEV: /channel -> /c chat route rename (#19782)

* DEV: Rnemae channel path to just c

Also swap the channel id and channel slug params to be consistent with core.

* linting

* channel_path

* params in wrong order

* Drop slugify helper and channel route without slug

* Request slug and route models through the channel model if possible

* Add client side redirection for backwards-compatibility

Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>

plugins/chat/test/javascripts/components/chat-channel-row-test.js

@@ -17,7 +17,10 @@ module("Discourse Chat | Component | chat-channel-row", function (hooks) {
 
     assert
       .dom(".chat-channel-row")
-      .hasAttribute("href", `/chat/channel/${this.categoryChatChannel.id}/-`);
+      .hasAttribute(
+        "href",
+        `/chat/c/${this.categoryChatChannel.slugifiedTitle}/${this.categoryChatChannel.id}`
+      );
   });
 
   test("allows tabbing", async function (assert) {